code: def setUp(self) -> None:
      self.root = tempfile.TemporaryDirectory()
  
file_path: mmocr/tests/test_datasets/test_preparers/test_dumpers/test_dumpers.py
imports: import json
  import os.path
  import tempfile
  import unittest
  from mmocr.datasets.preparers.dumpers import JsonDumper, WildreceiptOpensetDumper
label_desc: Use image node_id 1 for calling the TestDumpers obj's underlying member method code with example usage: obj.setUp() without return types